CN202853439U - Improved loop-type plate-type pulsation heat pipe - Google Patents

Abstract

The utility model belongs to the heat dissipation field of micro-electronics, and particularly relates to an improved loop-type plate-type pulsation heat pipe. The four ports of a four-way valve are respectively connected with a liquid filling port, a first stop valve, a second stop valve and a third stop valve through pipelines. The first stop valve is connected with a vacuum meter through a pipeline. The second stop valve is connected with an air exhausting hole through a pipeline. The third stop valve is connected with a plate-type pulsation heat pipe through a pipeline. The upper end of the plate-type pulsation heat pipe is a condensing end. The lower end of the plate-type pulsation heat pipe is a heating end. Each of head pipelines is respectively arranged at the condensing end and the heating end. The two head pipelines are connected through a plurality of sub-pipelines. With acetone as the working medium, by adopting an improved loop-type structure, and under the conditions that the liquid filling rate is 35% to 70% and the angle of inclination is 60 degrees to 90 degrees, stable operation of the improved loop-type plate-type pulsation heat pipe can be achieved. The improved loop-type plate-type pulsation heat pipe is suitable for the heat dissipation field of micro-electronics.

Description

Improve the loop type plate type pulsating heat pipe

Technical field

The utility model belongs to the microelectronics field of radiating, particularly a kind of improvement loop type plate type pulsating heat pipe.

Background technology

Pulsating heat pipe (pulsating heat pipe) is the newcomer of heat pipe family, have simple in structure, low cost and other advantages.Proposed in the 90's of last century by Akachi the earliest, successfully be used for now the electronic equipment cooling.The tubular type pulsating heat pipe is that tiny capillary brass pipe is bent to serpentine configuration, and plate type pulsating heat pipe refers to mill out pipeline at very thin aluminium sheet or copper coin.With the pulsating heat pipe sealing, be filled with working medium after vacuumizing, working medium exists with the form of liquid plug and vent plug under capillary effect.One end places fire end, and an end places condensation end, and vent plug and liquid plug that internal random forms can form Oscillation Flows at random under the effect of pressure differential, heat is flow to condensation end from evaporation ends, reach the purpose of heat transfer.

In numerous parameters that affect the pulsating heat pipe operation characteristic, the selection of pulsating heat pipe structure is an important class.Recent study scholar is relatively less to the research of this aspect.Mainly be how curved loop type pulsating heat pipe structure at present, also have the scholar to study for not isometrical pulsating heat pipe form.

The utility model content

Not enough for prior art, the utility model provides a kind of improvement loop type plate type pulsating heat pipe.

A kind of improvement loop type plate type pulsating heat pipe, 4 interfaces of its cross valve link to each other with implementation of port, the first stop valve, the second stop valve and the 3rd stop valve by pipeline respectively; The first stop valve links to each other with vacuum meter by pipeline, and the second stop valve links to each other with aspirating hole by pipeline, and the 3rd stop valve links to each other with plate type pulsating heat pipe by pipeline;

Described plate type pulsating heat pipe upper end is condensation end, and the lower end is fire end, and its condensation end and fire end arrange respectively 1 main pipe rail, link to each other by many bye-passes between two main pipe rails; Described plate type pulsating heat pipe is that thin aluminum sheet or sheet copper are processed by milling machine, working medium is filled into after the plate type pulsating heat pipe, working medium will be freely with the formal distribution of a plurality of working medium vent plugs and working medium liquid plug in two main pipe rails and every bye-pass;

The caliber of described every arm and every main pipe rail needs to satisfy following formula respectively:

$0.7\sqrt{\frac{\mathrm{\σ}}{({\mathrm{\ρ}}_{\mathrm{lip}}-{\mathrm{\ρ}}_{\mathrm{vap}})\·g}}\≤D\≤1.83\sqrt{\frac{\mathrm{\σ}}{({\mathrm{\ρ}}_{\mathrm{lip}}-{\mathrm{\ρ}}_{\mathrm{vap}})\·g}}$ ；

In the formula, σ is the working medium surface tension, and unit is N/m; ρ _LipBe the density of liquid phase of working medium, unit is kg/m ³ρ _VapBe the density of gas phase of working medium, unit is kg/m ³D is caliber, and unit is m; G is acceleration of gravity, and unit is m/s ²

The material of described metallic plate is aluminium or copper.

The thickness of described metallic plate is 2 mm ~ 4 mm.

The beneficial effects of the utility model are:

The utility model, adopts and improves the loop type structure as working medium with acetone, is 35% ~ 70% at liquid filled ratio, and the angle of inclination is under 60 ° ~ 90 ° conditions, can realize stable operation, is applicable to the microelectronics field of radiating.

Description of drawings

Fig. 1 is apparatus structure schematic diagram of the present utility model;

Fig. 2 is the local structure for amplifying schematic diagram of plate type pulsating heat pipe of the present utility model;

Fig. 3 is the thermal resistance variation diagram of the utility model under different angle;

Fig. 4 is the thermal resistance variation diagram of the utility model under different heating power;

Number in the figure: 1-vacuum meter; 2-the first stop valve; 3-the second stop valve; 4-the 3rd stop valve; The 5-plate type pulsating heat pipe; The 6-cross valve; The 7-implementation of port; The 8-aspirating hole; 9-working medium vent plug; 10-working medium liquid plug; The 11-bye-pass; The 12-main pipe rail; The 13-fire end; The 14-condensation end.

The specific embodiment

The utility model provides a kind of improvement loop type plate type pulsating heat pipe, below in conjunction with the drawings and specific embodiments the utility model is described further.

A kind of improvement loop type plate type pulsating heat pipe, 4 interfaces of its cross valve 6 link to each other with implementation of port 7, the first stop valve 2, the second stop valve 3 and the 3rd stop valve 4 by pipeline respectively; The first stop valve 2 links to each other with vacuum meter 1 by pipeline, and the second stop valve 3 links to each other with aspirating hole 8 by pipeline, and the 3rd stop valve 4 links to each other with plate type pulsating heat pipe 5 by pipeline;

Described plate type pulsating heat pipe 5 upper ends are condensation end 14, and the lower end is fire end 13, and its condensation end 14 arranges respectively between 12, two main pipe rails 12 of 1 main pipe rail with fire end 13 and links to each other by many bye-passes 11; Described plate type pulsating heat pipe 5 is that thin aluminum sheet or sheet copper are processed by milling machine, working medium is filled into after the plate type pulsating heat pipe 5, working medium will be freely with the formal distribution of a plurality of working medium vent plugs (9) and working medium liquid plug (10) in two main pipe rails 12 and every bye-pass 11;

The caliber of described every arm and every main pipe rail needs to satisfy following formula respectively:

$0.7\sqrt{\frac{\mathrm{\σ}}{({\mathrm{\ρ}}_{\mathrm{lip}}-{\mathrm{\ρ}}_{\mathrm{vap}})\·g}}\≤D\≤1.83\sqrt{\frac{\mathrm{\σ}}{({\mathrm{\ρ}}_{\mathrm{lip}}-{\mathrm{\ρ}}_{\mathrm{vap}})\·g}}$ ；

In the formula, σ is the working medium surface tension, and unit is N/m; ρ _LipBe the density of liquid phase of working medium, unit is kg/m ³ρ _VapBe the density of gas phase of working medium, unit is kg/m ³D is caliber, and unit is m; G is acceleration of gravity, and unit is m/s ²

The material of described metallic plate is aluminium or copper.

The thickness of described metallic plate is 2 mm ~ 4 mm.

At first select acetone as working medium, select the caliber scope at 1 mm ~ 3 mm, select the thick thin aluminum sheet of 3 mm or sheet copper to process.

Adopt aluminium sheet to be processed in the test and improve the loop type plate type pulsating heat pipe, carry out Study on Heat Transfer, provide the experiment test condition according to the structure of Fig. 1.Open first the first stop valve 2, the second stop valve 3 and the 3rd stop valve 4, adopt Double-stage rotary vane vacuum pump (absolute pressure of system can be evacuated to 0.2 Pa) to vacuumize by aspirating hole 8, observe the registration of vacuum meter, close the second stop valve 3 when reaching when vacuum requires, close vavuum pump.Can show vacuum by vacuum meter 1, through 6 hours, continue to observe the vacuum meter pointer, if it is good not change the illustrative system air-tightness, then close the first stop valve 2, be filled with working medium by implementation of port 7, close the 3rd stop valve 4.

At fire end 13, adopt the heating copper billet to carry out homogeneous heating, and voltmeter and ammeter monitoring heating power are installed.At condensation end 14 cooling water tank is housed, cools off by water-bath.Be evenly arranged respectively temperature point at fire end 13 and condensation end 14, to the temperature realization Real-Time Monitoring of fire end 13 and condensation end 14.

Experiment 1: select acetone as working media, liquid filled ratio is 70%, and at 90 °, under the differing tilt angles of 75 ° and 60 °, the angle of inclination refers to the angle of plane, plate type pulsating heat pipe place and horizontal plane.

As can be seen from Figure 3, pulsating heat pipe is in running, along with the increase thermal resistance of heating power presents reduction trend, along with the increase thermal resistance at angle of inclination presents reduction trend.Illustrate that the pulsating heat pipe gravity that is in operation plays facilitation to the backflow of working medium in the pulsating heat pipe, is conducive to the good operation of pulsating heat pipe.When angle of inclination during less than 60 °, experiment finds that the heat-transfer effect of pulsating heat pipe is not good.The range of tilt angles that pulsating heat pipe can well move is 60 ° ~ 90 °.

Experiment 2: selecting acetone as working medium, is under 90 ° at the angle of inclination, under the different liquid filled ratios (10%, 35%, 50 %, 70 %, 85 %), carries out heat transfer experiment to improving the loop type plate type pulsating heat pipe.

As can be seen from Figure 2, when liquid filled ratio was 10%, the heat transfer resistance of pulsating heat pipe was along with the increase of heating power presents ascendant trend, illustrated that pulsating heat pipe working medium is in the operation of can't normally pulsing for 10% time of low liquid filled ratio.When liquid filled ratio was 85%, the heat transfer resistance of pulsating heat pipe was apparently higher than the situation of liquid filled ratio 70%, illustrate when liquid filled ratio greater than 70% the time, the heat-transfer effect of pulsating heat pipe is variation.When liquid filled ratio 35% ~ 70% the time, pulsating heat pipe can move preferably, when this moment, heating power was low, can adopt lower liquid filled ratio, and heating power can adopt higher liquid filled ratio when higher.

Claims (3)

1. one kind is improved the loop type plate type pulsating heat pipe, and it is characterized in that: 4 interfaces of cross valve (6) link to each other with implementation of port (7), the first stop valve (2), the second stop valve (3) and the 3rd stop valve (4) by pipeline respectively; The first stop valve (2) links to each other with vacuum meter (1) by pipeline, and the second stop valve (3) links to each other with aspirating hole (8) by pipeline, and the 3rd stop valve (4) links to each other with plate type pulsating heat pipe (5) by pipeline;

Described plate type pulsating heat pipe (5) upper end is condensation end (14), and the lower end is fire end (13), and its condensation end (14) arranges respectively 1 main pipe rail (12) with fire end (13), links to each other by many bye-passes (11) between two main pipe rails (12);

The caliber of described every arm and every main pipe rail needs to satisfy following formula respectively:

$0.7\sqrt{\frac{\mathrm{\σ}}{({\mathrm{\ρ}}_{\mathrm{lip}}-{\mathrm{\ρ}}_{\mathrm{vap}})\·g}}\≤D\≤1.83\sqrt{\frac{\mathrm{\σ}}{({\mathrm{\ρ}}_{\mathrm{lip}}-{\mathrm{\ρ}}_{\mathrm{vap}})\·g}}$ ；

In the formula, σ is the working medium surface tension, and unit is N/m; ρ _LipBe the density of liquid phase of working medium, unit is kg/m ³ρ _VapBe the density of gas phase of working medium, unit is kg/m ³D is caliber, and unit is m; G is acceleration of gravity, and unit is m/s ²

2. a kind of improvement loop type plate type pulsating heat pipe according to claim 1, it is characterized in that: the material of described metallic plate is aluminium or copper.

3. a kind of improvement loop type plate type pulsating heat pipe according to claim 1, it is characterized in that: the thickness of described metallic plate is 2 mm ~ 4 mm.

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